A billionaire leaves a $0 tip for a struggling waiter—but a hidden note under the plate changes everything he thought he knew.

sat at his laptop and searched for Catherine Sterling. Pages of results came up. Articles about her company, interviews about her philanthropy, a Forbes profile from 2 years ago. He clicked through them, reading everything he could find.

Most of it was what he expected. Self-made billionaire, tech industry, started her company in her garage and built continue reading …